Garage floor drain – insulation and air tightness in CZ7b

I’m trying to achieve a reasonably air tight garage in CZ7b in case we someday have an EV and need to keep the garage warmer for the EV batteries.The garage… I’m trying to achieve a reasonably air tight garage in CZ7b in case we someday have an EV and need to keep the garage warmer for the EV batteries.The garage…Read MoreGreenBuildingAdvisor